DNA counterfeit-proof fiber together with spinning nozzle and method used to produced thereof

ABSTRACT

A spinning nozzle for producing the synthetic fibers and a method for producing a DNA counterfeit-proof fiber by the spinning nozzle are provided. The spinning nozzle includes a polymer solution inflow passage and a pair of water inflow passages located at the both sides of the polymer solution inflow passage, wherein the polymer solution inflow passage and the water inflow passages are converged into a mixing outflow passage and a synthetic fibers are produced at the outlet of the mixing outflow passage. A method for producing a DNA counterfeit-proof fiber by the spinning nozzle includes the steps as follows. First, mixing a plurality of the DNA microcapsules with a material solution to produce a polymer solution. Then, to form a converging interface between the polymer solution and the two streams of acid-hydrolysis waters. Afterwards, causing the flowing polymer solution to converge with the two streams of acid-hydrolysis waters for producing the DNA counterfeit-proof fiber.

FIELD OF THE INVENTION

The present invention relates to a deoxyribonucleic acid (DNA)counterfeit-proof fiber, the method thereof and the spinning nozzle formanufacturing thereof, and more particularly to the manufacture of thecounterfeit-proof fibers for preventing the counterfeiting of textiles.

BACKGROUND OF THE INVENTION

The counterfeit-proof principle of DNA is by means of thecharacteristics of unique, complex and difficult to copy of DNA toprotect the product from counterfeiting via mixing and/or adhering theDNA with some specific mediums (e.g. the colors, the glue, the resin orthe printing ink). Anti counterfeiting by DNA will increase the incomeand protect the goodwill.

The textiles, adding some specific materials for anti-counterfeiting,have not been sold in the market. At the present day, there are threemethods for anti-counterfeiting by adding some specific materials whichcan be recognized by machines described as follows. The first method isto integrate the vitamin B group into the fiber by plasma surfacemodification. The second is to graft the fiber and the chitosan byenzyme. The third is to package the specific DNA as the microcapsulesand to mix them with the fiber.

The three above methods seem to achieve the purposes of anticounterfeiting rapidly and effective of the textiles and being detectedby machines directly. But, after analyzing carefully with themanufacturing process of textiles, it is found that the purposes of anticounterfeiting rapidly and effective of textiles and being detected bymachines directly can be achieved only by the third method. The tworeasons are introduced as follows.

The first reason is regarding to the effects of scouring and bleachingprocess. Because the natural fibers mostly contain oil and dust, theyneed to be washed with the alkali and/or the soap. But the chitin(β-poly-N-acetly-D-glucosamin) and the chitosan (β-poly-D-glucosamin),different from other polysaccharides, are strongly electropositive sothat they will bond strongly with some specific chemicals, especiallythe negatively charged oil. So, if the counterfeit-proof fibers,grafting with the chitosan by enzyme, have been added before washingwith the alkali and/or the soap, the chitin and/or the chitosan willfall off during the washing process. In other words, the chitin and/orthe chitosan will bond with the oil adhered on the animal or the plantfibers. The chitin and/or the chitosan will solve in the soap-containedwashing waste during the scouring and bleaching process and certainlylose the effect for anti counterfeiting of textiles.

The chitin is the only natural monosaccharide in nature. It widelyexists in the shell of insects and crustaceans and the cell wall ofbacteria. Therefore, the chitin lacks the characteristic of unique sinceit is easily obtained. Applying the chitin to produce the functionalfiber may get well effects, but the chitin seems not appropriate forbeing used as the counterfeit-proof materials since it is easilycounterfeited. Therefore, that the chitin is applied to produce thecounterfeit-proof fibers is very limited.

The second reason is regarding to the effects of dyeing the fabric blankat high-pressure and high-temperature. After a textile is produced intoa fabric blank, it needs to be processed with a post-manufacturing ofdyeing at high-temperature for producing the colorful cloths. Therefore,whatever fabric materials the fabric blank produced therefrom, it needsto be processed with the high-temperature dyeing using several organicand/or inorganic dyes solved in the water. The fabric blank needs to bemaintained at the high temperature of 120-200° C. and high pressuresurrounding for 20-30 minutes for achieving a better outcome. But, thefibers had anti-counterfeiting and recognized functions by integratingthe vitamin B group into the fiber by plasma surface modification, whichwill be the pyrolysis at the high temperature. Moreover, thewater-soluble vitamin B group will be washed out from the fabric blankafter being treated with the high pressure and high temperature water.The vitamin B group, similar to the chitin, is easily obtained and lacksthe characteristic of unique. Therefore, the vitamin B group applied toproduce the counterfeit-proof fibers is very limited.

The third method for anti counterfeiting is using the microcapsuletechnique to package the specific DNA into the microcapsules and then tomix therewith fibers. Due to the mechanism for anti counterfeiting ofthis method causing the DNA microcapsules to be mixed with fibers, theDNA microcapsules are not easily lost and the properties ofheat-resistance and acid- and alkali-resistance thereof are outstanding.The fibers mixed with the DNA microcapsules maintain the originalproperties after heating at 250° C. for 40 minutes. Moreover, because ofthe properties of private and unique, DNA is appropriately applied foranti counterfeiting rapidly and effectively. But how to integrate theDNA microcapsules into the fibers effectively and uniformly and toincrease the stability thereof to further produce the fibers had DNAcounterfeit-proof technique are big challenges.

A microcapsule consists of a capsule core and a capsule membrane. Thecapsule membrane can be made by various natural or synthetichigh-molecular materials. The diameter of the microcapsule is 10-200 μmand the shape thereof is mostly spherical or polyhedral. The commonmethods for producing the microcapsule are the separating method and theinterfacial polymerization. The technique of the microsapsule had beenprovided since 1950's, and it was applied to manufacture the printingink of non-carbon paper originally. Recenly, the microsapsule techniquehas been applied to the fields of printing, medison, biochemistry andliquid crystal.

Because of the arising of environmental consciousness, the microsapsuletechnique is also applied to prevent the environmental pollution ofindustrial waste. For example, in the industry of textiles dyeing andfinishing, all the disperse dye, the acid dye, the cationic dye, the vatdye, the reactive dye and the oil-soluble dye can be packaged bymicrocapsules to be good for processing the waste. Moreover, by means ofthe microsapsule technique, some special materials can be packaged bythe microcapsules and further adhered to textiles to produce thefunctional textiles. So, the microsapsule technique develops vigorouslyand is majorly applied to the textiles of dyeing, calico printing, UVabsorbing, chemical asepticizing, blanching and adhering.

The processes of wet spinning are making a polymer to become a solublesalt (i.e. the spinning solution) by chemical treatments and spinningthe spinning solution to form the silks by a spinning nozzle. The silksare further returned to the solid ones by the coagulation bath. Finally,the silks need to be treated with drafting treatment. Besides, theviscosity of the spinning solution shall be noticed. If the viscosity ofthe spinning solution is too low, the spinning solution will easilybreaks to drops during spinning, but if the viscosity thereof is toohigh, the spinning solution will pass through the spinning nozzledifficultly. Usually, the low-viscosity and high-density spinningsolution can be obtained by increasing the temperature thereof. Thiskind of spinning solution is easily spun and the silks spun therefromare highly crystallized.

The above wet spinning spins via a single spinning nozzle locating inthe warm acid-hydrolysis solution. But the process of acid hydrolysis isunstable due to the hardly controlled operational environment. The spunsilks further need drawing to stabilize the size, and the manufacturingequipments thereof are huge and complex.

In conclusion, when spinning by wet spinning, due to the specialcharacteristics of DNA counterfeit-proof fiber, the spinning nozzle andthe spinning processes need to be adjusted for stabilizing the size offibers and simplifying the manufacturing equipments. But the knownspinning nozzles and spinning processes could not meet the aboverequirements.

SUMMARY OF THE INVENTION

In accordance with one aspect of the present invention, a spinningnozzle for producing a synthetic fiber is provided. The spinning nozzleincludes a polymer solution inflow passage and a pair of water inflowpassages located at the both sides of the polymer solution inflowpassage, wherein the polymer solution inflow passage and the pair ofwater inflow passages are merged into a mixing outflow passage, and thesynthetic fibers are produced at an outlet of the mixing outflowpassage. The manufacturing equipments of drawing of the traditionalspinning processes can be displaced with the spinning nozzle of thepresent invention, hence the cost will be decreased.

In accordance with another aspect of the present invention, a method forproducing a DNA counterfeit-proof fiber is provided. First, mixing aplurality of DNA microcapsules with a material solution to produce apolymer solution. Then, to form a converging interface between thepolymer solution and the two streams of acid-hydrolysis waters.Afterwards, to cause the flowing polymer solution to encounter with thetwo streams of acid-hydrolysis waters for producing the DNAcounterfeit-proof fiber. Different forms of DNA counterfeit-proof fiberscan be produced by adjusting the conditions of the convergence betweenthe polymer solution and the two streams of acid-hydrolysis waters.

In accordance with another aspect of the present invention, a DNAcounterfeit-proof fiber produced by the above method is provided.

In a preferable embodiment, a spinning nozzle includes a polymersolution inflow passage and a pair of water inflow passages, wherein thepolymer solution inflow passage providing a polymer solution forproducing a synthetic fiber and the pair of water inflow passageslocated at the sides of the polymer solution inflow passage andsupplying two streams of acid-hydrolysis waters. The polymer solutioninflow passage and the water inflow passages are merged into a mixingoutflow passage and a synthetic fiber is produced at an outlet of themixing outflow passage.

Preferably, the polymer solution includes a plurality of DNAmicrocapsules and the synthetic fiber is a DNA counterfeit-proof fiber.

Preferably, the polymer solution is formed by solving Nylon 6 in aformic acid first and then mixing therewith a plurality of DNAmicrocapsules.

Preferably, the two streams of acid-hydrolysis waters are deionizedwaters and have a temperature of 60° C.

Preferably, the pair of water inflow passages have respective centrallines symmetrical to what the polymer solution inflow passage has, andthe central lines of the pair of water inflow passages form an includedangle of 90°.

Preferably, the polymer solution is encountered in flanks by the twostreams of acid-hydrolysis waters in the mixing outflow passage forprocessing an acid-hydrolysis reaction.

Preferably, the polymer solution is convergently attacked by the twostreams of acid-hydrolysis waters in the mixing outflow passage forprocessing an acid-hydrolysis reaction.

In a preferable embodiment, a method for producing a DNAcounterfeit-proof fiber includes following steps. First, to prepare apolymer solution having a plurality of DNA microcapsules. Then, drivingthe polymer solution and driving the two streams of the acid-hydrolysiswater to approach the both sides of the polymer solution. Afterwards,causing the flowing polymer solution to encounter with the two streamsof acid-hydrolysis waters for producing the DNA counterfeit-proof fiber.

Preferably, the method for producing the DNA counterfeit-proof fiberincludes following pre-processing steps of purifying the acid-hydrolysiswaters to deionized waters and preheating the acid-hydrolysis waters to60° C.

Preferably, the steps of the method for producing a polymer solution areforming a Nylon 6 formic acid solution by solving Nylon 6 with a formicacid and then mixing therewith a plurality of the DNA microcapsules theNylon 6 formic acid solution.

Preferably, the polymer solution encountering with the two streams ofacid-hydrolysis waters is caused by a converging attack of the twostreams of acid-hydrolysis waters.

Preferably, the encountering between the flowing polymer solution andthe two streams of acid-hydrolysis waters further includes the followingsteps of convergently attacking the polymer solution by the two streamsof acid-hydrolysis waters to generate an acid hydrolysis, and to adjustthe flowing speed of the two streams of acid-hydrolysis waters forcontrolling the diameter and the quality of DNA counterfeit-proof fiber.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram showing the passages of spinning nozzlefor producing the synthetic fibers of present invention.

FIG. 2 is a photo showing the spinning and the acid hydrolysis ofpolymer solution in the spinning nozzle, wherein the spinning nozzle isincluded in a preferable embodiment of the method for producing the DNAcounterfeit-proof fiber of present invention.

FIG. 3( a) is a photo showing the forming of the DNA counterfeit-prooffibers produced by the method of FIG. 2, where Φ=1.0.

FIG. 3( b) is a photo showing the forming of the DNA counterfeit-prooffibers produced by the method of FIG. 2, where Φ=2.0.

FIG. 3( c) is a photo showing the forming of the DNA counterfeit-prooffibers produced by the method of FIG. 2, where Φ=0.5.

FIG. 4( a) is the diagram of the change of Reynolds Number (Re) of flowin the mixing outflow passage of DNA counterfeit-proof fiber, whereΦ=1.1.

FIG. 4( b) is the diagram of the change of Reynolds Number (Re) of flowin the mixing outflow passage of DNA counterfeit-proof fiber, whereΦ=2.0.

FIG. 4( c) is the diagram of the change of Reynolds Number (Re) of flowin the mixing outflow passage of DNA counterfeit-proof fiber, whereΦ=0.5.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

In order to further illustrate the techniques, methods and efficienciesused to procure the aims of this invention, please see the followingdetailed description. It is believable that the features andcharacteristics of this invention can be deeply and specificallyunderstood by the descriptions. It is to be noted that the followingdescriptions of preferred embodiments of this invention are presentedherein for the purposes of illustration and description only; it is notintended to be exhaustive or to be limited to the precise formdisclosed.

Please refer to FIG. 1, which is a schematic diagram showing thepassages of a spinning nozzle for producing the synthetic fibers of thepresent invention. In FIG. 1, the spinning nozzle 80 for producing thesynthetic fiber includes a polymer solution inflow passage 31 and a pairof water inflow passages 32, 33, wherein the polymer solution inflowpassage 31 is used to provide a polymer solution 41 for producing asynthetic fiber. The pair of water inflow passages 32, 33 locate at bothsides of the polymer solution inflow passage 31. The polymer solutioninflow passage 31 and the water inflow passages 32, 33 are merged into amixing outflow passage 34 and the synthetic fibers are produced at theoutlet of the mixing outflow passage 34.

In a preferable embodiment, the polymer solution 41 merging with the twostreams of acid-hydrolysis waters 42, 43 is caused by a convergingattack of the two streams of acid-hydrolysis waters 42, 43.

The polymer solution inflow passage 31, flowed through by the polymersolution 41 for producing the synthetic fibers, locates at the middle ofthe spinning nozzle 80 for producing the synthetic fibers. The syntheticfibers produced in the present embodiment is a DNA counterfeit-prooffiber, but the spinning nozzle 80 for producing the synthetic fibersalso can be used to produce various kinds of synthetic fibers. Thepolymer solution 41 includes a plurality of DNA microcapsules when thesynthetic fiber sought to produce is a DNA counterfeit-proof fiber.

The polymer solution of the DNA counterfeit-proof fiber is produced bysolving Nylon 6 with a formic acid first and mixing therewith aplurality of the DNA microcapsules. But, it is shall not be limited thatapplying to the fiber materials of Nylon 6 and the solvent of formicacid.

A pair of the water inflow passages 32, 33 locate at both sides of thepolymer solution inflow passage 31, wherein the pair of water inflowpassages 32, 33 have respective central lines symmetrical to what thepolymer solution inflow passage 31 has, and the central lines of thepair of water inflow passages 32, 33 form an included angle lower than180°. In the present embodiment, the central lines of the pair of waterinflow passages 32, 33 form an included angle of 90°.

Each of the water inflow passages 32, 33 is flowed through by a streamof acid-hydrolysis waters 42, 43, wherein the acid-hydrolysis waters aredeionized waters. The effect of the acid hydrolysis is better when theacid-hydrolysis waters 42, 43 are hot. In the present embodiment, theacid-hydrolysis waters 42, 43 have a temperature of 60° C.

Because the acid-hydrolysis waters 42, 43 approach the mixing outflowpassage 34 slopingly, therefore, when the polymer solution 41 and thetwo streams of acid-hydrolysis waters 42, 43 flow into the mixingoutflow passage 34, polymer solution 41 is encountered in flanks by thetwo streams of acid-hydrolysis waters 42, 43 for processing an acidhydrolysis reaction.

Preferably, an acid hydrolysis reaction of the polymer solution 41 isgenerated by a converging attack of two streams of acid-hydrolysiswaters 42, 43.

A method for produced a DNA counterfeit-proof fiber is introduced asfollows. Because the DNA microcapsule is heat-unstable, the spinningsystem for producing the DNA counterfeit-proof fiber must not use thetraditional method of the hot melt spinning but shall use the wetspinning with chemical solutions. Thus, the hot effects of producing canbe ignored completely. It only shall be noticed on the radio between theDNA microcapsules and the chemical solutions to decrease the variationof processes and the possibility of failure and to simplify theproducing of products.

The formula of polymer solution 41 including a plurality of DNAmicrocapsules is introduced as follows. The formula of the polymersolution 41 is (formic acid+Nylon 6)→(heating)→(mixing the DNAmicrocapsules (PS thin-film))→(cooling).

The formula of polymer solution 41 for the wet spinning is (formicacid+Nylon 6+DNA microcapsules)_(L)→(driving the polymer solution intothe spinning nozzle)→(mixing the deionizied waters)→(controlling the pHby acid hydrolysis)→(Nylon 6+DNA microcapsules)_(S)→(hot-airdrying)→(spinning), wherein _(L) means liquid and _(S) means solid.

The above wet spinning includes the following steps. To drive thepolymer solution 41 and to drive the two streams of acid-hydrolysiswaters 42, 43 approaching the both sides of polymer solution 41. Toconverge the polymer solution 41 and the two streams of acid-hydrolysiswaters 42, 43 to produce a DNA counterfeit-proof fiber.

Please refer to FIG. 2, which is a photo showing the spinning and theacid hydrolysis of polymer solution 41 in the spinning nozzle 80. InFIG. 2, the sectional size of polymer solution 41 of Nylon 6 is going tonarrowing because of the converging attacking by the two streams of hotacid-hydrolysis waters 42, 43. In the meanwhile, the acid hydrolysisoccurs and causes the polymer solution solidifying because of the acidsolutions releasing therefrom. Thus, a Nylon 6 fiber containing the DNAmicrocapsules is formed.

As shown in FIG. 2, after the acid solutions, mixing with the DNAmicrocapsules and Nylon 6 and flowing out from the polymer solutioninflow passage 31, flow into the mixing outflow passage 34, the size ofthe fiber will be determined by the flow rate of polymer solution 41 andthe two streams of acid-hydrolysis waters 42,43 because of thelimitation of spinning speed at the outlet of spinning nozzle 80. Thetwo streams of acid-hydrolysis waters 42, 43 (hot waters having atemperature of 60° C.), locates at the both sides of the polymersolution 41 respectively, are provided to generate the acid hydrolysisin the spinning process. The more acid-hydrolysis waters 42, 43 areadded, the better effect of the acid hydrolysis is preformed, and theincreasing acid-hydrolysis waters 42, 43 will narrow the fiber sizebecause the flowing speed at the outlet of mixing outflow passage 34 isfixed. On the contrary, the less acid-hydrolysis waters 42, 43 areadded, the larger fiber size is formed, but the physical properties ofthe fiber will be influenced because of the insufficient degree of acidhydrolysis.

Based on the above reasons, it can be known that the spinning processconvergently attacking with a higher flow rate of hot waters seemsbetter. But, actually, the fiber will not meet the following examiningrequirements because it is too thin to contain enough DNA microcapsules.The optimum fiber size, figured out from the effective examiningconcentration of the simple, is larger than 50 μm.

In order to characterize the fluid properties of spinning nozzle at themicro-scale, the radio of quantitative flow rates is defined asΦ=m_(inner)/m_(outer), wherein the m_(inner) refers to the quantitativeflow rate of polymer solution 41 and the m_(outer) refers to the totallyquantitative flow rate of the two streams of acid-hydrolysis waters.

Please refer to FIGS. 3( a), 3(b) and 3(c), wherein FIG. 3( a) is photoshowing the forming of the DNA counterfeit-proof fibers produced by themethod of FIG. 2, where Φ=1.0. FIG. 3( b) is a photo showing the formingof the DNA counterfeit-proof fibers produced by the method of FIG. 2,where Φ=2.0. FIG. 3( c) is a photo showing the forming of the DNAcounterfeit-proof fibers produced by the method of FIG. 2, where Φ=0.5.In FIGS. 3( a), 3(b) and 3(c), under the situation of stable outletpressure and total flow rate, the size of fibers can be controlled byadjusting the flow rates of the two streams of acid-hydrolysis waters.By adjusting the quantitative flow rate form Φ=2.0 to Φ=0.5, the size offibers are correspondingly changed from 100 μm to 25 μm.

The distribution of the speed of flow is introduced as follows. Pleaserefer to FIGS. 4( a), 4(b) and 4(c). FIG. 4( a) is the diagram showingthe change of Reynolds Number (Re) of flow in the mixing outflow passageof DNA counterfeit-proof fiber, where Φ=1.0. FIG. 4( b) is the diagramshowing the change of Reynolds Number (Re) of flow in the mixing outflowpassage of DNA counterfeit-proof fiber, where Φ=2.0. FIG. 4( c) is thediagram showing the change of Reynolds Number (Re) of flow in the mixingoutflow passage of DNA counterfeit-proof fiber, where Φ=0.5. TheReynolds Numbers of FIGS. 4( a), 4(b) and 4(c) are measured by amicro-particle image velocimetry (Micro-PIV).

In FIGS. 4( a), 4(b) and 4(c), the acid-hydrolysis waters 42, 43 in themixing outflow passage 34 of spinning nozzle 80 and the polymer solution32 are added to react therewith simultaneously, wherein theacid-hydrolysis waters 42, 43 are the greater part thereof. Moreover,because of the converging attacking of acid-hydrolysis waters, theflowing range of polymer solution 41 will be narrowed and hence flow inhigh speed. Therefore, there is a greatly difference of flowing speed atthe part which is near the interface between the inner flow of polymersolution 41 and the outer flows of two streams of acid-hydrolysis waters42, 43. But in a very short distance, the inner flow and the outer flowswith different speed therebetween will couple rapidly and form atypically parabolic complete expanded flow.

All of the diagrams of FIGS. 4( a), 4(b) and 4(c) have three curvestherein respectively. The curves refer to the distribution curves offlow speed of passage sections at the flowing directions of Y=75 μm,Y=130 μm and Y=250 μm respectively, which is recorded at the start ofinner flow and outer flows approaching therewith. In FIGS. 4( a), 4(b)and 4(c), wherein the x refers to the distance from a flow to the wallof mixing outflow passage 34 of spinning nozzle 80, the dimensionlessperformance parameter of Reynolds Number is VL/ν, the ν is the Kinematicviscosity and the L is the distance from the core of inner flow to thewall of mixing outflow passage 34 of spinning nozzle 80.

In FIGS. 4( a), 4(b) and 4(c), it is found when the quantitative flowrates between the inner flow and outer flows are more different, theinner fluids will flow faster caused by the outer fluids and the size offiber is smaller. But if the forming speed is too fast, the amount ofDNA microcapsules of a unit length will be decreased. Therefore, whenΦ=1.0, the dimensionless performance parameter Re is 3.5 approximately(i.e. 250 μm/sec of the average of flowing speed) and the diameter offiber is 50 μm, which is known from the measured results of speed. Thus,under the condition that the volume of fibers is approximately 0.02 C.C.per inch and the DNA microcapsules concentration of fibers is 1 mg/C.C.,one inch of the fiber contains 0.02 mg of the DNA microcapsules. Underthe same condition, it is enough for following PCR analysis by sampling100 inch of fibers.

The feature of the present invention is a spinning nozzle for producingthe synthetic fibers includes a polymer solution inflow passage and apair of water inflow passages, wherein a polymer solution inflow passageproviding a polymer solution for producing a synthetic fiber and thepair of water inflow passages at the both sides of the polymer solutioninflow passage and supplying two streams of acid-hydrolysis waters, andthe polymer solution inflow passage and the water inflow passages aremerged into a mixing outflow passage and the synthetic fiber areproduced at an outlet of the mixing outflow passage.

The steps of the method using the mentioned spinning nozzle to produce aDNA counterfeit-proof fiber are described as follows. First, preparing apolymer solution having a plurality of the DNA microcapsules. Then,driving the polymer solution and driving two streams of acid-hydrolysiswaters to approach the both sides of the polymer solution. Afterwards,causing the flowing polymer solution to converge with the two streams ofacid-hydrolysis waters for producing the DNA counterfeit-proof fiber.

While the invention has been described in terms of what are presentlyconsidered to be the most practical and preferred embodiments, it is tobe understood that the invention need not be limited to the disclosedembodiment. On the contrary, it is intended to cover variousmodifications and similar arrangements included within the spirit andscope of the appended claims, which are to be accorded with the broadestinterpretation so as to encompass all such modifications and similarstructures. Therefore, the above description and illustration should notbe taken as limiting the scope of the present invention which is definedby the appended claims.

1. A spinning nozzle producing a synthetic fiber, comprising: a polymersolution inflow passage providing a polymer solution for producing thesynthetic fiber; and a pair of water inflow passages located at bothsides of the polymer solution inflow passage and supplying two streamsof acid-hydrolysis waters, wherein the polymer solution inflow passageand the water inflow passages are merged into a mixing outflow passageand the synthetic fiber are produced at an outlet of the mixing outflowpassage.
 2. A spinning nozzle according to claim 1, wherein the polymersolution includes a plurality of DNA microcapsules and the syntheticfiber is a DNA counterfeit-proof fiber.
 3. A spinning nozzle accordingto claim 2, wherein the polymer solution is formed by solving Nylon 6 ina formic acid first and then mixing therewith the plurality of DNAmicrocapsules.
 4. A spinning nozzle according to claim 1, wherein thetwo streams of acid-hydrolysis waters are deionized waters.
 5. Aspinning nozzle according to claim 1, wherein the two streams ofacid-hydrolysis waters have a temperature of 60° C.
 6. A spinning nozzleaccording to claim 1, wherein the pair of water inflow passages haverespective central lines symmetrical to what the polymer solution inflowpassage has, and the central lines of the pair of water inflow passagesform an included angle of 90°.
 7. A spinning nozzle according to claim1, wherein the polymer solution is encountered in flanks by the twostreams of acid-hydrolysis waters for processing an acid hydrolysisreaction.
 8. A spinning nozzle according to claim 7, wherein the polymersolution is convergently attacked by the two streams of acid-hydrolysiswaters.
 9. A method for producing a DNA counterfeit-proof fiber,comprising steps of: (a) preparing a polymer solution having a pluralityof the DNA microcapsules; (b) driving the polymer solution and drivingtwo streams of acid-hydrolysis waters approaching to the both sides ofthe polymer solution; and (c) causing the flowing polymer solution toencounter with the two streams of acid-hydrolysis waters for producingthe DNA counterfeit-proof fiber.
 10. A method according to claim 9,comprising before Step (a) a step of: (p) pre-purifying the two streamsof the acid-hydrolysis waters to be deionized waters.
 11. A methodaccording to claim 9, comprising before Step (a) a step of: (q)preheating the two streams of the acid-hydrolysis waters to have atemperature of 60° C.
 12. A method according to claim 9, wherein Step(a) further comprises steps of: (a1) solving Nylon 6 with a formic acidto generate a Nylon 6 formic acid solution; and (a2) mixing theplurality of the DNA microcapsules with the Nylon 6 formic acid solutionto generate the polymer solution.
 13. A method according to claim 9,wherein Step (c) further comprises a step of: (c2) adjusting flowingspeeds of the two streams of acid-hydrolysis waters to control adiameter and a quality of the DNA counterfeit-proof fibers.
 14. A methodaccording to claim 9, wherein the flowing polymer solution encounteringwith the two streams of acid-hydrolysis waters is caused by a convergingattack of the two streams of acid-hydrolysis waters.
 15. A method forproducing a DNA counterfeit-proof fibers, comprising steps of: (a)preparing a polymer solution having a plurality of the DNAmicrocapsules; and (b) encountering the polymer solution with the twostreams of acid-hydrolysis waters for processing an acid hydrolysisreaction and producing a DNA counterfeit-proof fiber.